Investments - Low-Income Housing Tax Credit Fund Investments (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
Jun. 30, 2022	Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Investment, book balance	$ 7.7	$ 2.9
Investment, remaining commitments for additional capital contributions	5.1	0.1
Investment, amortization expense	0.2	0.5
Investment, tax credit	$ 0.3	$ 0.5

Amount of affordable housing tax credits and other tax benefits recognized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 740
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=116633289&loc=SL49122993-202985

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Amount of investment in qualified affordable housing projects.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 740
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=116633289&loc=SL49122993-202985

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Amount of amortization expense of investment in qualified affordable housing projects.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 740
-Section 50
-Paragraph 2
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-URI https://asc.fasb.org/extlink&oid=116633289&loc=SL49122993-202985

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Amount of commitment or contingent commitments to qualified affordable housing project investments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 740
-Section 50
-Paragraph 2
-Subparagraph (e)
-URI https://asc.fasb.org/extlink&oid=116633289&loc=SL49122993-202985

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